EP 0185361 A2 19860625 - Method of and apparatus for the measurement of the refractive-index profile in monomode optical fibres.
Title (en)
Method of and apparatus for the measurement of the refractive-index profile in monomode optical fibres.
Title (de)
Verfahren und Vorrichtung zur Messung des Brechungsindexprofils in Monomode-Licht-leitfasern.
Title (fr)
Méthode et dispositif pour la mesure du profil de l'indice de réfraction dans des fibres optiques monomodes.
Publication
Application
Priority
IT 6825684 A 19841218
Abstract (en)
The refractive-index value is obtained by radially scanning a near-field image of the fibre output face (3) and by computing, for each image point, the ratio between a first intensity value, obtained in the presence of a mask (6), having transmittivity proportional to the fourth power of the transversal beam coordinate and located in a far-field plane, and a second intensity value, obtained in the absence of such a mask. An automated measurement apparatus for implementing the method is also provided.
IPC 1-7
IPC 8 full level
G01M 11/00 (2006.01); G01N 21/41 (2006.01); G01M 11/02 (2006.01); G02B 6/00 (2006.01)
CPC (source: EP US)
G01M 11/33 (2013.01 - EP US); G01N 21/412 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0185361 A2 19860625; EP 0185361 A3 19871223; EP 0185361 B1 19890816; CA 1235923 A 19880503; DE 185361 T1 19880428; DE 3572395 D1 19890921; IT 1179877 B 19870916; IT 8468256 A0 19841218; JP H0325731 B2 19910408; JP S61148341 A 19860707; US 4664516 A 19870512
DOCDB simple family (application)
EP 85116102 A 19851217; CA 497701 A 19851216; DE 3572395 T 19851217; DE 85116102 T 19851217; IT 6825684 A 19841218; JP 27708285 A 19851211; US 77908285 A 19850920